CR95HF UART communication

valentin2 · ‎2016-11-15

Posted on November 15, 2016 at 11:28

Hello,

I am writing this post because i have a problem with UART communication. I am using à microcontroller in order to communicate with the CR95HF chip but i can't have any response even when i'm sending an echo command. However, both pins SSI_0 and SSI_1 are connected to the ground and i'm pulling down the UART_RX/IRQ_IN more than 10us after i powered up the CR95HF chip as it's written in the datasheet.

I figured out a problem, my UART_TX/IRQ_OUT pin is always at 0V, but even if i link a pull-up resistor, i still have no answers.

Can anyone help me with my problem? i would really appreciate.

Best regards

Peter Boringer · ‎2016-11-25

Posted on November 25, 2016 at 16:39

Hello Valentin,

The described setup seems fine don't you mixed the TX and RX from the micro processor to the CR95HF TX of CR95HF should be the RX of the uP whereas RX of CR95HF has to be connected to the TX of the uP.

Else can you provide a schematics of the up to CR95HF part

Regards

View solution in original post

valentin2 · ‎2016-11-17

Posted on November 17, 2016 at 10:10

No one ever had the same problem ?

Peter Boringer · ‎2016-11-25

Posted on November 25, 2016 at 16:39

Hello Valentin,

The described setup seems fine don't you mixed the TX and RX from the micro processor to the CR95HF TX of CR95HF should be the RX of the uP whereas RX of CR95HF has to be connected to the TX of the uP.

Else can you provide a schematics of the up to CR95HF part

Regards